Add regular expression support in json_schema component

components/json_schema/json_schema_validator_unittest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/values.h"
 #include "components/json_schema/json_schema_validator.h"
 #include "components/json_schema/json_schema_validator_unittest_base.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 class JSONSchemaValidatorCPPTest : public JSONSchemaValidatorTestBase {
@@ skipping 116 matching lines @@
       "      ]"
       "    }"
       "  },"
       "  \"additionalProperties\": {"
       "    \"type\": \"any\""
       "  }"
       "}", &error)) << error;
   EXPECT_TRUE(JSONSchemaValidator::IsValidSchema(
       "{"
       "  \"type\": \"object\","
+      "  \"patternProperties\": {"
+      "    \".\": { \"type\": \"any\" },"
+      "    \"foo\": { \"type\": \"any\" },"
+      "    \"^foo$\": { \"type\": \"any\" },"
+      "    \"foo+\": { \"type\": \"any\" },"
+      "    \"foo?\": { \"type\": \"any\" },"
+      "    \"fo{2,4}\": { \"type\": \"any\" },"
+      "    \"(left)|(right)\": { \"type\": \"any\" }"
+      "  }"
+      "}", &error)) << error;
+  EXPECT_TRUE(JSONSchemaValidator::IsValidSchema(
+      "{"
+      "  \"type\": \"object\","
       "  \"unknown attribute\": \"that should just be ignored\""
       "}",
       JSONSchemaValidator::OPTIONS_IGNORE_UNKNOWN_ATTRIBUTES,
       &error)) << error;
   EXPECT_FALSE(JSONSchemaValidator::IsValidSchema(
       "{"
       "  \"type\": \"object\","
       "  \"unknown attribute\": \"that will cause a failure\""
       "}", 0, &error)) << error;
 }